Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Revenues:
Total revenues	$ 1,524,072	$ 1,484,306	$ 4,744,656	$ 4,552,292
Costs and expenses:
Cost of services and product development	474,218	475,342	1,480,979	1,448,097
Selling, general and administrative	762,557	711,729	2,269,753	2,113,633
Depreciation	30,733	29,082	90,134	82,993
Amortization of intangibles	20,220	22,170	62,318	68,100
Acquisition and integration charges	0	159	0	977
Goodwill impairment	150,000	0	150,000	0
Total costs and expenses	1,437,728	1,238,482	4,053,184	3,713,800
Operating income	86,344	245,824	691,472	838,492
Interest expense, net	(16,279)	(17,961)	(41,493)	(57,170)
Gain on event cancellation insurance claims	0	300,000	0	300,000
Other (expense) income, net	(583)	(991)	4,304	4,404
Income before income taxes	69,482	526,872	654,283	1,085,726
Provision for income taxes	34,125	111,823	167,204	230,584
Net income	$ 35,357	$ 415,049	$ 487,079	$ 855,142
Net income per share:
Basic (in dollars per share)	$ 0.47	$ 5.36	$ 6.37	$ 10.98
Diluted (in dollars per share)	$ 0.47	$ 5.32	$ 6.35	$ 10.90
Weighted average shares outstanding:
Basic (in shares)	74,884	77,484	76,466	77,880
Diluted (in shares)	74,987	77,968	76,758	78,444
Insights
Revenues:
Total revenues	$ 1,270,724	$ 1,209,524	$ 3,789,798	$ 3,582,238
Conferences
Revenues:
Total revenues	74,554	75,776	358,558	331,929
Consulting
Revenues:
Total revenues	123,573	127,622	418,873	405,291
Other
Revenues:
Total revenues	$ 55,221	$ 71,384	$ 177,427	$ 232,834